What are the causes of sudden episodes of fatigue?
There are many reasons why someone may have sudden episodes of fatigue, such as not getting enough sleep/insomnia, dealing with a pressured work environment, and medical conditions, like fibromyalgia, heart disease or even arthritis.
Someone may experience sudden episodes of fatigue because of something underlying, such as cancer or multiple sclerosis. However, it can also be something as simple as a lifestyle choice, such as eating too much greasy food. If you are worried about your symptoms the best first step is to speak to your GP.
Common reasons for sudden episodes of fatigue:
- Restless sleep
- Lack of sleep
- Too little exercise
- Too much exercise
- Diet
- Low iron levels
- Stress
- Pre-existing mental health conditions, such as anxiety
- Medical conditions
- Allergies
Fatigue and mental health
Depression
There is a strong link between depression and fatigue with up to 90% of people experience sleep disturbances having depression.
Depression disturbs the central nervous system, causing issues with neurotransmitter function, such as dopamine and serotonin. This hormonal imbalance negatively affects sleep, mood, and the ability to function as normal day to day, exacerbating fatigue symptoms.
Depression is also linked to restless sleep which ultimately contributes to fatigue and low energy throughout the day. Even though depression is closely connected to fatigue, having sudden episodes of fatigue doesn’t mean you have depression.
Read our article Depression and Self-Care
Stress and burnout
Stress is common and expected in the busy lives we lead in modern society, and it will affect everyone at some point in their lives. Continued stress will eventually lead to burnout if not treated and this can be debilitating on mental health.
Like depression, extreme fatigue and stress are closely linked but they are not mutually exclusive. Someone experiencing stress may not feel extremely fatigued and vice versa. Despite this, they aggravate each other, encouraging a negative cycle of feeling stressed and fatigued if left untreated.
Rwelated article: How to prevent burnout
Anxiety
Anxiety is the feeling of fear and hesitation when faced with a stressful situation or a trigger. It plunges the mind into what is called the ‘fight or flight’ response, releasing a surge of hormones and emotions into the body. It’s common to feel drained and tried after this response because the body goes through physical symptoms, such as nausea, muscle tensions, and chest pain.
Often, people with anxiety disorders, such as post-traumatic stress disorder and panic disorder, worry about things excessively and thus have a higher risk of fatigue.
To give an example, someone with social anxiety disorder may not want to go out with friends as social interactions easily zap their energy and causes fatigue.
Sleep also has a part to play in this. Like stress, anxiety can leave people worrying at night when they want to fall asleep, encouraging less sleep and more fatigue the next day.